Continuous wave radar signal processing method based on single-target triangular linear frequency modulation

A linear frequency modulation and signal processing technology, applied in the field of radar, can solve the problems of difficult measurement and noise, achieve good distance and speed, easy to implement, and does not reduce the signal-to-noise ratio.

Inactive Publication Date: 2019-05-21
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the frequency spectrum of the moving target is also basically similar, and there is noise. After subtraction, the energy is basically canceled and will be submerged in the noise, which is difficult to use for subsequent measurements.

Method used

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  • Continuous wave radar signal processing method based on single-target triangular linear frequency modulation
  • Continuous wave radar signal processing method based on single-target triangular linear frequency modulation
  • Continuous wave radar signal processing method based on single-target triangular linear frequency modulation

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Embodiment Construction

[0075] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0076] Method of the present invention comprises the following steps:

[0077] Step 1: The radar generates a symmetrical triangular linear FM continuous wave and transmits it; the specific process is as follows:

[0078] The radar generates symmetrical triangular linear FM continuous wave st(t) as:

[0079] the s t (t)=A 1 exp[j2π(ft±0.5μt 2 )]t∈T

[0080] In-phase component s it (t) and the orthogonal component s qt (t) are respectively:

[0081] the s it (t)=A 1 cos[2π(ft±0.5μt 2 )]t∈T

[0082] the s qt (t)=A 1 sin[2π(ft±0.5μt 2 )]t∈T

[0083] where A 1 is the amplitude of the transmitted signal, f is the carrier frequency, the positive and negative signs represent the situation of modulating the up and down frequency modulation slope, μ=B / T is the frequency modulation slope, and T is the cycle of up and down frequency modulation. B is t...

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Abstract

The invention provides a continuous wave radar signal processing method based on single-target triangular linear frequency modulation, which comprises the steps that radar generates a multi-period symmetrical triangular linear frequency modulation continuous wave and transmits the multi-period symmetrical triangular linear frequency modulation continuous wave; an echo signal received by the radarand a local oscillator signal are mixed, and pass through a low-pass filter to obtain an up-regulation frequency band difference frequency signal and a down-regulation frequency band difference frequency signal; FFT processing is carried out on the up-regulation frequency band difference frequency signal and the down-regulation frequency band difference frequency signal to obtain a difference frequency spectrum, the difference frequency spectrums of multiple periods are accumulated, a threshold is set, frequency points exceeding the threshold are obtained, equal frequency points are found outand subjected to zero setting, and fixed clutters are eliminated; a relation between the remaining frequency points and a speed distance is established to obtain a target distance and a speed; and thesignal is enabled to pass through a band-pass filter of the residual frequency points to obtain a target angle. According to the invention, the positions of the frequency points of clutters in the same period in the up-regulation frequency band and the down-regulation frequency band are not changed, so that the frequency points are set to be zero by setting the threshold and comparing the frequency points, in this way, the clutters can be well eliminated, the signal-to-noise ratio is not reduced, and the method is easy to implement.

Description

technical field [0001] The invention belongs to the field of radar, and in particular relates to a single-target triangular linear frequency modulation continuous wave radar signal processing method. Background technique [0002] Continuous wave radar is a radar system that uses continuous wave signals as transmission signals to obtain target distance, velocity and angle information. This radar technology has a long history. Continuous wave radar mainly has the following advantages: [0003] (1) No distance blind zone [0004] Because the continuous wave radar can transmit and receive signals at the same time, there is no distance blind zone defect in the pulse radar system. This is undoubtedly a very important advantage for detecting short-range targets. [0005] (2) Higher distance resolution [0006] The distance resolution of the radar is related to the bandwidth of the radar transmitting signal, the larger the bandwidth, the higher the distance resolution of the rad...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 邓科吴景波
Owner XI AN JIAOTONG UNIV
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